Fuzzy Walls during Bubble Expansion in Bubble Garnet Films

概要

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The dynamic wall structure of bubble domains during radial expansion in as-grown (YLuSmCa)_3(FeGe)_5O_<12> bubble garnet has been studied by high speed sampling optical photography using a dye-laser with 6 ns pulse duration. The wall motion was observed as a function of a pulse drive field H_d applied along the film normal up to 200 Oe and also of a d.c. in-plane field H_<in> up to about 50 Oe. When the in-plane field exceeds 20 Oe for H_d larger than 50 Oe, the bubbles expand elliptically exhibiting a velocity anisotropy between parallel and perpendicular directions with respect to the in-plane field direction. The fuzzy, broad wall image and the asymmetry in wall image subjected to the polarity of the in-plane field were found. It is suggested that the fuzzy wall image is a consequence of the inclination of the wall plane with respect to the film plane resulted from the velocity variation inside the sample.
社団法人応用物理学会の論文
1980-04-05